![Tesla Science Center at Wardenclyffe on Twitter: "Today is World Radio Day! How many of you know what FM and AM actually stand for? Hint: think of waves. We'd love to hear Tesla Science Center at Wardenclyffe on Twitter: "Today is World Radio Day! How many of you know what FM and AM actually stand for? Hint: think of waves. We'd love to hear](https://pbs.twimg.com/media/Ef5MMh3XkAEEzOd.jpg)
Tesla Science Center at Wardenclyffe on Twitter: "Today is World Radio Day! How many of you know what FM and AM actually stand for? Hint: think of waves. We'd love to hear
![Nikola Tesla German Patent 143453 - Method and Device for Secure Transmission by Means of Electrical Impulses Nikola Tesla German Patent 143453 - Method and Device for Secure Transmission by Means of Electrical Impulses](https://teslauniverse.com/sites/default/files/styles/default_large/public/images/2021-10/de-143453-1-01.jpg?itok=jRsvO0DG)
Nikola Tesla German Patent 143453 - Method and Device for Secure Transmission by Means of Electrical Impulses
![File:US patent 1119732 Nikola Tesla 1907 Apparatus for transmitting electrical energy.png - Wikimedia Commons File:US patent 1119732 Nikola Tesla 1907 Apparatus for transmitting electrical energy.png - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/4/41/US_patent_1119732_Nikola_Tesla_1907_Apparatus_for_transmitting_electrical_energy.png)